Electrolux R and Renaissance Micro Filtration Bag, 12 Bags Treated with Ultra-Fresh ELECTROLUX Guardian, Guardian Encore, Lux 9000, Renaissance and Epic 8000 (C134, C154, C104 Series) Canisters Micro Filtration vacuum bags also capture 99% of particles 5 microns in size, including household fibers and other microscopic allergens The Ultra-Fresh finish on these bags protect against odor and stain-causing microbial growth; This helps keep your bag cleaner and fresher Ultra-Fresh treated bags are guaranteed from defects